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Just to digress a little, I was watching one of the series 'Great American Railroad Journeys' done for the BBC by Michael Portillo, an ex-politician.

He had got to San Diego, and was visiting Mirimar base. During his intro, in the background, this caught my attention - is the US Navy finally giving up on expensive non-flyers and buying Swedish ?????

(incidentally, I hope you all read about the late arrival of the first four F-35 all-weather fighters to the UK. The reason for the lateness? - 'unfavourable weather conditions'.......)

I think there are several philosophies about the best prop design leading to different shapes.
Just thinking of the squared off prop tips of e.g. the Trojan or the L188 Electra which can be seen only on US designs, if I'm not wrong.

I believe that it's French; the background is familiar; and I might even have used it on another forum many years ago - none of which helps me remember what it is! Oh, the effect of advancing years upon the memory.